34-150-1 Elevator PLC Application

Description

The Elevator is an advanced plc application used to illustrate the
principles of PLC interfacing and control based on a real life
application.

Starting with simple programme sequences to control
elevator speed, direction and floor arrival/departure, the student can
progress to more advanced floor request handling. The elevator car moves
between floors in response to requests from call buttons at each floor
and within the elevator car (located on an external panel).

Sensors
indicate which floor the elevator car is at and provide advance warning
to allow the car to be slowed prior to arriving at the destination
floor. A brake allows the car to be held at a floor while the motorised
car door is operated to allow occupants to enter or leave and a sounder
is provided to announce arrival.

The internal controller
provides closed-loop motor speed control using logic interfaces. The
elevator is controlled by a PLC with a minimum of 16 sink inputs and 16
dc source or relay outputs.